| Harpenden to Cutrofiano | 1,196.74 mi (1,925.97 km) |
| Harpenden to Dalmine | 621.31 mi (999.90 km) |
| Harpenden to Deruta | 851.57 mi (1,370.47 km) |
| Harpenden to Desenzano del Garda | 661.67 mi (1,064.86 km) |
| Harpenden to Desio | 610.48 mi (982.47 km) |
| Harpenden to Dolianova | 973.08 mi (1,566.02 km) |
| Harpenden to Dolo | 717.49 mi (1,154.69 km) |
| Harpenden to Domodossola | 555.07 mi (893.29 km) |
| Harpenden to Dorgali | 925.56 mi (1,489.55 km) |
| Harpenden to Dueville | 689.11 mi (1,109.02 km) |
| Harpenden to Eboli | 1,064.17 mi (1,712.62 km) |
| Harpenden to Elmas | 977.43 mi (1,573.02 km) |
| Harpenden to Empoli | 765.62 mi (1,232.14 km) |
| Harpenden to Enna | 1,214.24 mi (1,954.12 km) |
| Harpenden to Eraclea | 732.35 mi (1,178.61 km) |
